We report combined x-ray and Raman studies of beryllium in helium and argon pressure media at pressures approaching 200 GPa. Our results are generally consistent with recent studies confirming the stability of the hexagonal close-packed phase to the highest pressures. However, the quasihydrostatic conditions of our studies lead to a stiffer equation of state K0=109.88, K0 =3.59 and a gradual ap...

As a fundamental property of pressure-induced amorphization (PIA) in ice and ice-like materials (notably α-quartz), the occurrence of mechanical instability can be related to violation of Born criteria for elasticity. The most outstanding elastic feature of α-quartz before PIA has been experimentally reported to be the linear softening of shear modulus C44, which was proposed to trigger the tra...

Abstract The Case A 41–year–old asymptomatic male was referred to our cardiology outpatient clinic for diagnostic evaluation of a suspected bicuspid aortic valve at transthoracic echocardiography. Trans–oesophageal imaging ruled–out the valve, but detected an accessory membrane lining interatrial septum with double–layered appearance encompassing most fossa ovalis. Agitated saline infusion demo...

We have investigated the elastic properties of the cubic dense Kondo compound Ce0.75La0.25B6 by means of ultrasonic measurements. We have obtained magnetic fields vs. temperatures (H−T ) phase diagrams under magnetic fields along the crystallographic [001], [110] and [111] axes. An ordered phase IV showing the elastic softening of c44 locates in low temperature region between 1.6 K and 1.1 K be...

Detailed study of the equation of state, elasticity, and hardness of selected superconducting transition-metal nitrides reveals interesting correlations among their physical properties. Both the bulk modulus and Vickers hardness are found to decrease with increasing zero-pressure volume in NbN, HfN, and ZrN. The computed elastic constants from first principles satisfy c11 > c12 > c44 for NbN, b...

This paper describes a software package for computing nonparametric efficiency estimates, making inference, and testing hypotheses in frontier models. Commands are provided for bootstrapping as well as computation of some new, robust estimators of efficiency, etc. JEL classification: C14; C15; C44

We report the adiabatic elastic constants of single-crystal thorium dioxide over a temperature range 77–350 K. Time-domain Brillouin scattering, an all-optical, non-contact picosecond ultrasonic technique, is used to generate and detect coherent acoustic phonons that propagate in bulk perpendicular surface crystal. These lattice vibrations have been monitored two hydrothermally grown samples al...

Sayers and Kachanov (1991) defined crack-influence parameters that are shown to be directly related to Thomsen (1986) weak-anisotropy seismic parameters for fractured reservoirs when the crack/fracture density is small enough. These results are then applied to the problem of seismic wave propagation in polar (i.e., non-isotropic) reservoirs having HTI seismic wave symmetry due to the presence o...

The position of singular lines for orthorhombic (ORT) media with fixed diagonal elements the elasticity matrix cij, i=1…6 is studied under condition that c11, c22, c33>c66>c44>c55. In this case, off-diagonal coefficients c12, c13, c23 are chosen so some values d12=c12+c66, d13=c13+c55, d23=c23+c44 zero. For medium, where only one d12, d13, d23 zero, contains points in planes symmetry. ...

Then, the limit points of the sequence of plays are correlated equilibria. In fact, for each correlated equilibrium there is some calibrated learning rule that the players can use which results in their playing this correlated equilibrium in the limit. Thus, the statistical concept of a calibration is strongly related to the game theoretic concept of correlated equilibrium. Journal of Economic ...